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Creating Telephony Applications for Both Windows® and Linux

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Creating Telephony Applications for Both Windows® and Linux Application Note Dialogic Research, Inc. Dual OS Applications Creating Telephony Applications for Both Windows® and Linux: Principles and Practice Application Note Creating Telephony Applications for Both Windows® and Linux: Principles and Practice Executive Summary To help architects and programmers who only have experience in a Windows® environment move their telephony applications to Linux, this application note provides information that aims to make the transition easier. At the same time, it takes into account that the original code for Windows may not be abandoned. The ultimate goal is to demonstrate how to create flexible OS-agnostic telephony applications that are easy to build, deploy, and maintain in either environment. Creating Telephony Applications for Both Windows® and Linux: Principles and Practice Application Note Table of Contents Introduction .......................................................................................................... 2 Moving to a Dual Operating System Environment ................................................. 2 CMAKE ......................................................................................................... 2 Boost Jam .................................................................................................... 2 Eclipse .......................................................................................................... 3 Visual SlickEdit ............................................................................................. 3 Using Open Source Portable Libraries .................................................................. 3 Boost Libraries .............................................................................................. 3 Log4cplus ..................................................................................................... 3 Xerces XML .................................................................................................. 3 Common System-Level Operations in Windows and Linux .................................... 4 Application Code Organization .............................................................................. 4 User Interface Strategies ...................................................................................... 5 Command Line ............................................................................................. 5 Web Interface ............................................................................................... 5 Java Abstract Window Toolkit ........................................................................ 5 Tcl and Tk .................................................................................................... 5 Common Source File Problems ............................................................................ 6 Text File Incompatibilities .............................................................................. 6 Tab Size Compatibility ................................................................................... 6 Source Code Beautifiers ................................................................................ 6 Differences in Dialogic® Products for Windows and Linux ..................................... 6 Programming Models .................................................................................... 7 Installation .................................................................................................... 7 Configuration and System Service Startup ..................................................... 7 Logging and Diagnostics ............................................................................... 8 Usage Differences for the Dialogic® R4 API on Windows and Linux ...................... 9 Manipulating Voice Data Files for Play and Record ....................................... 9 System Runtime Library Differences ............................................................. 9 Use of gc_Start and gc_Stop in Global Call Applications ................................ 9 Appendix A: Sample Scripts to Aid in Cross-Operating-System Builds ................. 10 Acronyms .......................................................................................................... 12 For More Information ......................................................................................... 12 1 Application Note Creating Telephony Applications for Both Windows® and Linux: Principles and Practice Introduction makefiles, each of which defines the source components With the increasing use of Linux in the enterprise, many that are compiled and linked into an executable or library companies need to address a growing demand for for the application. One or more higher-level makefiles are Linux-based telephony applications. A desirable solution is then used to tie the lower-level makefiles together. to port existing applications containing the required Generally, the simplest approach for moving from an ® functionality from the Windows operating system to existing Visual C++/.NET to a Linux/GNU C++ Linux to take advantage of the lower costs and new environment is to create appropriate makefile templates and capabilities available there. then add the information needed to produce specific To make existing Windows applications portable so that makefiles for a project. The template includes placeholders they will work well in both environments, note the for source code (C or C++), header files, directory following key design rules: specifications, and library references for an application. • Minimize the use of OS-specific features Adding project-specific information can be automated by • Maximize the use of libraries and packages that will writing a script that extracts the component parts from a work on both operating systems Visual C++/.NET project file and adds them to the • Separate user interface and processing code clearly makefile template. See Appendix A for a sample script that does such an extraction. • Avoid graphical user interfaces (GUIs) specific to either operating system Unfortunately, this approach results in two separate • Isolate OS-specific code in a single area, rather than descriptions of the application. Each will require updating spreading it throughout the entire application as changes are made, and they are very likely to get “out of sync.” A generally more reliable approach involves using a • Adopt development practices that avoid conflicts neutral utility to specify and handle the edit/build/debug/ between processes in the operating systems deploy process. Some possible tools include CMAKE, If the existing application is modular and well designed Boost Jam, Eclipse, and Visual SlickEdit. and organized, applying the principles listed above should not be difficult. CMAKE CMAKE is an open source tool that generates Although this application note is written specifically for OS-independent projects and makefiles. Configuration developers using Dialogic® telephony boards and directives are put into text files in each directory of a software and the Dialogic® R4 API, it concentrates on a project. When CMAKE traverses the directory tree for the general discussion of the basic differences in developing for project, it adds the necessary options to the two operating systems. A number of sections provide OS-specific build environment that it is creating. Thus, it general porting guidelines and consider important issues is possible to build both Linux makefiles and a Microsoft® before specific Dialogic R4 API concerns are discussed. In .NET project from the same set of code and directives. addition, this application note does not focus on developing specifically for Dialogic® boards that use For more information, visit http://www.cmake.org/ Dialogic® System Release software or Dialogic® Host HTML/Index.html. Media Processing (HMP) software, but instead discusses general issues that apply to both. Boost Jam Boost Jam is a build system for creating multi-platform Moving to a Dual Operating System Boost Open Source C++ Libraries, which are described Environment below. The first step in porting from Windows to Linux is to Boost Jam supports a wide variety of Unix and Microsoft establish a usable framework for building applications. platforms, including Visual C++ for Windows and the Under Microsoft Visual C++ or .NET, a workspace or GNU C Compiler (GCC) for Linux. A jamfile, much like solution contains individual projects. Each of these projects a makefile, consists of a sequence of rules that define the is a separate executable or library. The equivalent under build process and a set of target files on which the rules Linux/GNU C++ is a set of project-specific operate. Conditional statements in the jamfile handle the 2 Creating Telephony Applications for Both Windows® and Linux: Principles and Practice Application Note differences between operating systems. Once the jamfile is Using Open Source Portable Libraries defined, it can be used for builds on either platform by Many open source projects are available that are portable invoking the jam executable with an argument specifying and non-OS-specific. These projects provide functionality the platform in use. suitable for many different kinds of applications and can For more information, visit http://www.boost.org/tools/ save development time. build/v2/index.html. Boost Libraries Eclipse Boost Libraries are intended to be extensions of the C++ Eclipse is a comprehensive open source IDE platform written in Java with a host of optional features that may Standard
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